This genuine Brother-brand A Foot / Buttonhole Foot allows the user (on compatible machines) to sew a one-step buttonhole. Simply place your button in the clasp and slide the lever closed so the button is held tight and will not move — this then communicates to the sewing machine how big the buttonhole needs to be. It’s that easy!
This foot usually comes standard in-the-box on machines that offer a one-step buttonhole. If your A Foot / Buttonhole foot is lost or damaged, this serves as a replacement.